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Finding the Fourth Proportional to 3,985.65, 5,978.52 and 1,388.61

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Solution

The fourth proportional to 3,985.65, 5,978.52 and 1,388.61 is: 2,082.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,985.65 : 5,978.52 = 1,388.61 : x
  2. Step 2: Convert to fraction form
    3,985.65/5,978.52 = 1,388.61/x
  3. Step 3: Cross multiply
    3,985.65x = 5,978.52 × 1,388.61
  4. Step 4: Simplify right side
    3,985.65x = 8,301,832.66
  5. Step 5: Solve for x
    x = 8,301,832.66/3,985.65
  6. Step 6: Final answer
    x = 2,082.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.